From a3aaadb90495be0d75886f555b4a0f42ed98a825 Mon Sep 17 00:00:00 2001
From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Mon, 28 Feb 2022 21:51:56 +0000
Subject: [PATCH] increase timescale of icarus simulation to cover the period
 for coldboot.bin to initialise DRAM and perform read/write tests

---
 simsoc.ys      | 7 +++++--
 src/simsoctb.v | 4 ++--
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/simsoc.ys b/simsoc.ys
index 4bf1530..1a7780a 100644
--- a/simsoc.ys
+++ b/simsoc.ys
@@ -4,15 +4,18 @@ read_verilog  ../uart16550/rtl/verilog/uart_defines.v
 read_verilog  ../uart16550/rtl/verilog/uart_rfifo.v
 read_verilog  ../uart16550/rtl/verilog/uart_top.v
 read_verilog  ../uart16550/rtl/verilog/timescale.v
-read_verilog  ../uart16550/rtl/verilog/uart_receiver.v
 read_verilog  ../uart16550/rtl/verilog/uart_sync_flops.v
-read_verilog  ../uart16550/rtl/verilog/uart_transmitter.v
 read_verilog  ../uart16550/rtl/verilog/uart_debug_if.v
 read_verilog  ../uart16550/rtl/verilog/uart_regs.v
+read_verilog  ../uart16550/rtl/verilog/uart_transmitter.v
+read_verilog  ../uart16550/rtl/verilog/uart_receiver.v
 read_verilog  ../uart16550/rtl/verilog/uart_tfifo.v
 read_verilog  ../uart16550/rtl/verilog/uart_wb.v
 read_verilog  ./external_core_top.v
 
+setattr -mod -set keep 1 uart_transmitter
+setattr -mod -set keep 1 uart_receiver
+
 delete w:$verilog_initial_trigger
 proc_prune
 proc_clean
diff --git a/src/simsoctb.v b/src/simsoctb.v
index 5a5dd26..77e5035 100644
--- a/src/simsoctb.v
+++ b/src/simsoctb.v
@@ -69,7 +69,7 @@ module simsoctb;
 
   // uart, LEDs, switches
   wire uart_tx ;
-  reg uart_rx = 0;
+  wire uart_rx;
   wire led_0;
   wire led_1;
   wire led_2;
@@ -150,7 +150,7 @@ module simsoctb;
   initial
     begin
       // run for a set time period then exit
-      #5000000;
+      #120000000;
 
       $finish;
     end
-- 
2.30.2